84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
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/*
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This module uses the Python CObject or Capsule interface to import pointers to
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functions and variables defined in the _quisk Python extension module. These functions and
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variables can then be used in another extension module. This is an alternative to linking
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the other extension module to _quisk with the C linker. This interface is used by the SDR-IQ
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extension module, and you can use that as a model.
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This feature exists because of Maitland Bottoms, AA4HS, who requested the feature and provided patches.
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To use this interface in your own extension module, first modify your setup.py or makefile so that
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you are not linking in symbols from the _quisk module. Add import_quisk_api.c to your source files.
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Then add this define before including quisk.h:
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#define IMPORT_QUISK_API
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#include "quisk.h"
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Add this code after Py_InitModule() in your module init function (PyMODINIT_FUNC):
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// Import pointers to functions and variables from module _quisk
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if (import_quisk_api()) {
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printf("Failure to import pointers from _quisk\n");
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return; //Error
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}
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Use this new function to set your Start/Stop/Read functions (if used):
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quisk_sample_source(&quisk_start_sdriq, &quisk_stop_sdriq, &quisk_read_sdriq);
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Change references to quisk_sound_state to use the pointer pt_quisk_sound_state everywhere. For
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example, replace this:
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quisk_sound_state.read_error++;
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with this:
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pt_quisk_sound_state->read_error++;
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*/
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#include <Python.h>
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void ** Quisk_API; // array of pointers to functions and variables from module _quisk
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struct sound_conf * pt_quisk_sound_state; // pointer to quisk_sound_state
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#if ( (PY_VERSION_HEX < 0x02070000) || ((PY_VERSION_HEX >= 0x03000000) && (PY_VERSION_HEX < 0x03010000)) )
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// Old Python interface using CObject
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int import_quisk_api(void)
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{
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PyObject *c_api_object;
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PyObject *module;
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module = PyImport_ImportModule("_quisk");
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if (module == NULL) {
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printf("Failure 1 to import Quisk_API\n");
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return -1;
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}
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c_api_object = PyObject_GetAttrString(module, "QUISK_C_API");
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if (c_api_object == NULL) {
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Py_DECREF(module);
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printf("Failure 2 to import Quisk_API\n");
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return -1;
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}
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if (PyCObject_Check(c_api_object)) {
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Quisk_API = (void **)PyCObject_AsVoidPtr(c_api_object);
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}
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else {
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printf("Failure 3 to import Quisk_API\n");
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Py_DECREF(c_api_object);
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Py_DECREF(module);
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return -1;
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}
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Py_DECREF(c_api_object);
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Py_DECREF(module);
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pt_quisk_sound_state = (struct sound_conf *)Quisk_API[0];
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return 0;
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}
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#else
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// New Python interface using Capsule
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int import_quisk_api(void)
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{
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Quisk_API = (void **)PyCapsule_Import("_quisk.QUISK_C_API", 0);
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if (Quisk_API == NULL) {
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printf("Failure to import Quisk_API\n");
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return -1;
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}
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pt_quisk_sound_state = (struct sound_conf *)Quisk_API[0];
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return 0;
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}
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#endif
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